p {
  margin: 0;
}
.controls {
  display: flex;
  align-items: center;
}
.play {
  position: relative;
  width: 40px;
  height: 40px;
  border: 1px solid #fff;
  border-radius: 50%;
  outline: none;
  background: rgba(5, 5, 5, .4);
}
.play.player::before {
  position: absolute;
  display: block;
  content: '';
  width: 0;
  height: 0;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-style: solid;
  border-color: transparent transparent transparent #000; 
  border-width: 10px 0 10px 10px;
  opacity: .4;
}
.play.pause::after {
  position: absolute;
  display: block;
  content: '';
  width: 5px;
  height: 15px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 1px solid #000;
  border-top: 0;
  border-bottom: 0;
}
.progress {
  position: relative;
  display: inline-block;
  width: 300px;
  height: 5px;
  border: 1px solid #ccc;
  border-radius: 5px;
}
.progress__cache {
  position: absolute;
  display: inline-block;
  content: '';
  background: yellow;
  height: 100%;
}
.progress__time {
  position: absolute;
  display: inline-block;
  display: block;
  content: '';
  background: red;
  height: 100%;
  border-radius: 5px;
}

.video__time {
  display: inline-block;
}
/*.current__time {

}
.total__time {

}*/
.volume {
  display: inline-block;
  width: 100px;
  height: 6px;
}
.volume__bar {
  position: relative;
  width: 100%;
  height: 100%;
  border: 1px solid #ccc;
  border-radius: 5px;
}
.volume__bar__round {
  position: absolute;
  display: inline-block;
  width: 15px;
  height: 15px;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  background: #ccc;
  border-radius: 50%;
}